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A nucleotide-controlled conformational switch modulates the activity of eukaryotic IMP dehydrogenases

DOI: 10.1038/s41598-017-02805-x DOI Help

Authors: Ruben M. Buey (Universidad de Salamanca) , David Fernández-justel (Universidad de Salamanca) , Íñigo Marcos-alcalde (CSIC-UAM) , Graeme Winter (Diamond Light Source) , Paulino Gómez-puertas (CSIC-UAM) , Jose Maria De Pereda (ICSIC-Universidad de Salamanca) , José Luis Revuelta (Universidad de Salamanca)
Co-authored by industrial partner: No

Type: Journal Paper
Journal: Scientific Reports , VOL 7

State: Published (Approved)
Published: June 2017
Diamond Proposal Number(s): 10121

Open Access Open Access

Abstract: Inosine-5′-monophosphate dehydrogenase (IMPDH) is an essential enzyme for nucleotide metabolism and cell proliferation. Despite IMPDH is the target of drugs with antiviral, immunosuppressive and antitumor activities, its physiological mechanisms of regulation remain largely unknown. Using the enzyme from the industrial fungus Ashbya gossypii, we demonstrate that the binding of adenine and guanine nucleotides to the canonical nucleotide binding sites of the regulatory Bateman domain induces different enzyme conformations with significantly distinct catalytic activities. Thereby, the comparison of their high-resolution structures defines the mechanistic and structural details of a nucleotide-controlled conformational switch that allosterically modulates the catalytic activity of eukaryotic IMPDHs. Remarkably, retinopathy-associated mutations lie within the mechanical hinges of the conformational change, highlighting its physiological relevance. Our results expand the mechanistic repertoire of Bateman domains and pave the road to new approaches targeting IMPDHs.

Journal Keywords: Biochemistry; Structural biology; X-ray crystallography

Subject Areas: Biology and Bio-materials, Chemistry


Instruments: I03-Macromolecular Crystallography

Other Facilities: ALBA

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art%3A10.1038%2Fs41598-017-02805-x.pdf